Get a big gatorade bottle or a big water bottle. Or even a 2 or 3 liter coke bottle. Then get a scissor and poke a hole into the side of the bottle. Get some string and put it through the hole. Where the big hole is at the top of the bottle pull the string through it. Tape it with some duct tape. put some rocks on the back and front to weigh it down in the water. Put some bread in the bottle or/and beef jerky. They catch minnows and crayfish. When you are making the top of the bottle better, if you are, make a funnel of duct tape. so the the fish go in but it is too small to get it.